Shimano's Dynamo Front Hub powers up your lights with 6v and 3.0 watt output. The Shimano Dynamo Nexus works ideally with your touring or commuting bike that may need to power up lights and other accessories.
The hub was easily built into a 700c wheel using DT Swiss spokes and the Mavic A319 rim. No issues at all. Although the description doesn't show it, this appears to be the Shimano DH-3N80 hub.
At first the amount of effort to manually spin the hub was concerning, but once the wheel was built up it's far less noticeable.
While riding in general the drag from the hub is hardly apparent. The only time that I really notice any impact is when coasting as it appears to have a slight amount of vibration and I do notice a minor slow down. However compared to a typical friction dynamo this is still superior.
The benefits of the hub greatly offset the minimal drag. This is definitely aimed at commuters and touring. I would not recommend this for anything where you're being timed.
I paired this with a Busch & Müller Luxos U and Toplight Brake Plus. I'm extremely satisfied so far with all 3 components. They work together excellent.
I built this into a 700 wheel for my touring bike. I run the current into a Werk USB and further run it into my phone, GPS, lights and back up battery while I am touring. I no longer have to worry about finding plug-ins. I have been in the rain with no problem (I use balloon sleeves over the USB connectors to keep water out). I added a switch to control the constant flow required by my phone.
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